Turn-under stitching device



June 10, 1930. c. H. DESAUTELS 1,762,356

' TURN-UNDER s'rmcnme DEVICE 4 Filed May 11, 1929 3 Sheets-Sheet 2 I N VEIY TOR. Char/es .H. Desaufe/S.

ATTORNEY.

Patented June 10,.193Q

RUBBER COMPANY, on omco'pnn FALLS, rvriissncnnsns'i s, A CORPORATION or 'MASSACHUSE'DTS r l Turin-"Linnea s ricrciiiiie Davies Application filed my 11, My inventioriireliates to tire building ap paratus and inore particularly to a stitching device which constitutes an improvement of the stitching device shown Williani F. 5; Irrgangs pending application, Serial Nurnber 196,796, filed' June' 6, 1927', Patent Number 1,716,585, Jurr 'inlssa v I One object of my invention is to provide a stitching device that will stitch around 13 and under the beadscertain of the carcass plies, chafing. strip, etc, and at thesanie time break the carcass from the building drum. Another object l'SItCJ) provide a stitcher of such character that will work equally well on double as well as single beadtires'.

Still further objects will be apparent from the following specification and claims. the drawings which illustrate one embodiy nient of my inventlon,

according to my invention;

Fig. 2 is a partial front view of the-niachine shown in Fig. 1", partly in section and:

the position of parts at the end of the stitch-.

ing operation; v

FigsJjfT and 18 are views taken, respectively, on the lines 77 and 88 of Fig. 6; and 7 Figs. 9 to 14 are diagrai'nniatic views showing" roll movenients.

semi-flat building. drum, that is a drum arched adjacent the beads, one ofthe prob le ns from a mass production viewpoint is to provide asirnple' stitching apparatus that will accomplish quickly and easily the turn.- ing underof certain of the carcass plies,

chafing strips, ;etc., around and under the bead. The advent of. the semi-fiat or crowned'type' buildingdrums has made pos of j the Fig. l is a side view of atire building chine equipped with stitchers constructed In the building of tire carcasses on a.

1329. Serial No. 362,275;

tires by this method, thusa stitching device a character previou'slfv mentioned should be unive'rs'al'to' all sizes, that is it should be able to perfori'nthe stitchingopere ation equally a's wellonall the different size carcassesregardless of the size". and contour of the drum or whether the carcass is a singleor niu'ltibea'd' size;

Mvi'nvention successfully niets all the previously 'iijientione'd requirementsqand in:

addition it certain other jadvantages. In di arming-S a tire building dijuin" indicated at 10 is; supported by means of collapsible chuck 9"ajnd' ho'ufsin'g'll Whiclji is housed suitabled ri'ving mechanism for etatl ng the druminthe direction of the arrow int-Fig. 1. invent-ion asembod'ied inthej drawingscomprises stitching mus; 26 mounted onofl set arrn's 18 and I have shown these latter attached to a suitable appara,

tus which willirnp aift to them the desired movements to accomplish th'e stitching operation. i

A' standard lno'iin'ted'substantially as,

showiii in relationto the building drum 10 and pivotally supports arms 13 which in turn serveto adjustably position, bythe'use of adjusting bolt 15, a,11o11tw shaft. 14 so that the latter is. freeto be rotated. Bushings 16 adjustably secured to the hollowshaft 14; are formed to, receive theround shank portions 17bit ofi se t ariiis '18' and, as

best shown in- Fig 3, a thrust collar arrangeiiient 27 be usedrto assume the,v load and wear of the parts. Binions, 19 forlnedlon vth e'end of the round shaiikportions 17. engage racks 20 which are adjustably secured to a common split collar arrangement 21 adapted to" slide on thehollow V.

shaft 14'. A link 22 connectsthe spli't collar arrangement 21 to one v arm of a"; lever 23 which is positioned a slot in the hollow shaft leand pivoted. to: the latter atj24.

The other: arm oflthe leveri23 is adapted to receive a handle'2 5 which, whe nbthe apparatus is ininoperative position, isheld.

y 's t aeh t0- ee' h uses It will. be evidentfrom the ioregoing that the time 25 see" a) have in two planes,

the standard 12, thus limiting the degree of of the arms 18.

pivoting of the offset arms 18 toward the drum 10.

As best shown in Fig. 3, the stitching rolls 26 are mounted on the arms 18 so that their axes will make an angle of approximately 93 with the aXes of the round shank portions 17 This is an important feature of my invention and its advantage will readily be seen in the following paragraph. In the drawings I have shown a partially built tire carcass 33, the head portion of which has a contour substantially as shown in Figs. 5 and 7,'and is of a double bead construction. In Fig. 1 a chafing strip 34 is shown as just applied and the operation of the apparatus to stitch it around and under the bead is as follows. The handle 25 is operated to pivot the arm 18 and stitcher rolls 26 into contact-'with the carcass as shown in Fig; 4. It will be noted that when the roll 26 engages the 'carcass'the plane of the flange 32 is substantially at right angles to aradius of the drum. The operator then continues the pivotingmovement and also commences the rotating movement a three degree angle with the shoulder of- 'duce the chafing strip.

to ca use thelroll 26 to follow the contour of the bead portion as indicated bythe dotted line position in Fig. In Figs. 6, 7' and 8 I have shown the position of parts at the end 'of the stitching operation, the stop 30 being against the abutment 31 and the roll 26 wedgedin between the drum and the carcass forcing thelatter away from the drum.

Due to the previously mentioned 93 angle between the axis of thestitching roll and the axis of the arm aplane passing through theflange 32 of the roll 26, when in the position shown in Fig.7, makes approximately the drum. The object of this is to make the leading edge of the flange 32 tuck and stitch the chafing strip into place and leave the trailing edge ofthe flange out of contact with the carcass.

This is advantageous as the trailing edge of the roll would tend to undo the work. of the leading edge and form wrinkles. This angle is also advantageous as the carcass is thus displaced so as to intro- Another advantage of displacing the carcass is that by this operation the bond between the carcass and the drum, desirable during the preceding building'steps but no longer needed, is ruptured, thus the two operations of stitching the chafing strip under the bead and break ing the carcass from the drum are accomplished simultaneously.

It will be understood that both Stitchers operate at the same time except in opposite directions and also that carcass elements other than the chafing strips may be stitched around the head in the same way. 7

In Figs. 9 to 14 inclusive I have illustrated diagrammatically, how the compound movement of the roll enables it to stitch around bead portions of various cross-sec tional dimensions and contours. Center lines 36 represent the vertical plane in which the center of rotation (r) of the arm 18 moves. The circular center line 37 described about the center of rotation (7*) indicates the path of travel of the contacting point of the roll. For clearness I have indicated the center of rotation (r) with sub-numbers corresponding to the figure showing the position of the roll in respect/to the indicated (1").

Fig. 9 shows the starting position of the roll in respect .to a head portion of a double bead type, 1? showing the positionofthe center of rotation of the arm in the plane 36. By applying the pivoting and rotating movements in combination, as indicated by the arrows, the roll follows the contour of the head portion with a yieldable pressure, the extent of which is determined by the operator. Fig. 10 shows an intermediate position in the stitching operation, the distance between Wand 11 indicating the 0X- tent that the center of rotation has risen and Fig. 11 shows the stop position with 1' indicating ,the'highest or stop position of the center of rotation. 'Figsj12, 13 and 1 1 show the same respective operative positions as Figs. 9,10 and 11, but operating on a single head type, the only difference in the roll settings being in the location and travel of the center of rotation as indicated by 1', 1' and r and the contacting point of the roll.

From the foregoing it can be readily seen that the roll willstitch bead portions of substantially any shape provided they lie within the mechanical limitation of the device and that the roll'is always at an eflective stitching angle in respect to the head portion.

Having thus described my invention, I claim:

1. A device for forming material around and under the head portion of a tire supported and rotated by a tire building drum arched adjacent the head, which comprises .a flanged stitching roll mounted for movei ment so that the contacting point of the flange of the roll describes an are around the head portion, the center of which lies outside th'e hea'd portion and the plane of the flange being substantially tangent to the said are and means operable to move theroll bodily in an axial plane of the drum, said bodily movement being variable with respect to the arcuate movement. g

2. A device for forming material around and under the bead portion of a tire carcass supported on a tire building drum, which comprises a flanged stitching roll mounted for vertical movement adjacent the bead in a substantially axial plane of the drum and in an are passing through the plane of the bead portion, the plane of the flange of the roll being substantially tangent to the are described by the contacting point of the flange and means for simultaneously impart-' ing the said movements to the roll.

8. A device for forming material around and under the bead portions of a tire carcass while the latter is supported on a rotatable drum which is arched adjacent the beads, comprising arms mounted for movement substantially radially toward and from the axis of the drum in planes parallel to and adjacent the planes of the bead portions, means to rotate said arms about axes lying in said planes and rotatable discs so mounted on the arms that said discs will describe arcs passing through the planes of the bead portions and means to simultaneously rotate the arms on their axes and move them radially toward and from the axis of the drum.

4. A device for. forming material around and under the bead portion of a tire carcass while the latter is supported on a rotatable drum which is arched adjacent the beads, comprising a longitudinally rotatable arm pivoted at one end to permit movement of its free end substantially radially toward and from the axis of; the drum in a plane parallel to .and adjacent theplane of the bead supporting portion of the drum, a freely rotatable disc mounted'on the free end of the arm,'the axis ofthe disc making an angle of substantially 93 with the axis of the arm inthe direction of rotation of the drum'and means to simultaneously rotate the arm about its axis and swing it about its pivot. V 1

CHARLES H. DESAUTELSV 

